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lyzzy7
Group Title
multiple choice question! please help!
Suppose y varies directly with x, and y = 14 when x = –4. What is the value of y when x = –6?
–21
10
18
21
 one year ago
 one year ago
lyzzy7 Group Title
multiple choice question! please help! Suppose y varies directly with x, and y = 14 when x = –4. What is the value of y when x = –6? –21 10 18 21
 one year ago
 one year ago

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jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
y varies directly with x means that y = kx
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
when x = 4, y is y = 14 so y = kx turns into 14 = k*(4)
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
solve for k and tell me what you get
 one year ago

lyzzy7 Group TitleBest ResponseYou've already chosen the best response.1
3.5, But I think Im wrong..
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
you're correct
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
so y = kx turns into y = 3.5x
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
now they want to know the value of y when x = 6
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
so y = 3.5x y = 3.5(6) y = ???
 one year ago

lyzzy7 Group TitleBest ResponseYou've already chosen the best response.1
thank yoouuu!:))
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
nailed it
 one year ago

lyzzy7 Group TitleBest ResponseYou've already chosen the best response.1
can you walk me through this one too? Suppose y varies directly with x, and y = 25 when x = 140. What is the value of x when y = 36?
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
y varies directly with x means what
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
good
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
we're given x = 140 and y = 25 so y = kx becomes 25 = k*140
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
so k = ____
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
I would use more decimal places for k. I'm going to use k = 0.17857 so y = kx becomes y = 0.17857x Now plug in y = 36 and solve for x y = 0.17857x 36 = 0.17857x 36/ 0.17857 = x 201.601613 = x x = 201.601613 now round to the nearest tenth to get 201.6 this is the same as 201 and 3/5 or the improper fraction 1008/5
 one year ago

jim_thompson5910 Group TitleBest ResponseYou've already chosen the best response.1
optionally... y = kx 25 = k*140 25/140 = k k = 25/140 k = 5/28  y = kx y = (5/28)x 36 = (5/28)*x 36*28 = 5x 1008 = 5x 5x = 1008 x = 1008/5 So x = 1008/5 which is x = 201.6 in decimal form
 one year ago
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